以三峡船闸为例建立槛上水深变化的理论计算模型,对上下游水位和最小槛上水深的关系进行分析,阐明最小槛上水深发生的特征.针对当前通航调度规程规定的部分特征水位情况,利用该模型对船闸槛上水深控制部位和最小值进行测算,为合理发布过闸船舶吃水控制标准提供理论依据. Taking the TGP ship lock as an example, a theoretical calculation model of water depth changes was established, and the relationship between the water level at the upper and lower reaches and the water depth at the minimum threshold was analyzed to clarify the characteristics of water depth at the minimum threshold.According to the status of some characteristic water levels stipulated in current navigation schedule, The model is used to calculate the control position and the minimum value of the water depth on the ship sill, which provides a theoretical basis for the reasonable issuance of the control standard of the ship sizhing.